@book{14936,
	author = {Marks, John L. and Purdy, Charles Richard},
	title = {Teaching elementary school mathematics for understanding},
	publisher = {McGraw-Hill},
	year = {[1965]},
	series = {McGraw-Hill series in education. Supervision, curriculum, and methods in education},
	address = {New York},
	edition = {2d ed.},
	note = {First ed. published in 1958 under title: Teaching arithmetic for understanding.}
}